Disk sharpener



June 2, 1931. D. c. GALVIN- 1,807,978

DISK SHARPENER Filed June 4, 1929 Patented June 2, 1931 DENNIS C. GALVIN, OF DES MOINES, IOWA PATENT OFF DISK SHARPEN'EB i I Application filed June 4, 1929. Serial No. 368,272.

My invention relates to that type of disk sharpeners in which there is provided a pair of parallel rolls, one being yieldingly held toward the other for the purpose of admitting the edge portion of a disk between them, and rolling it'out to a sharp edge on a true circle.

The object of my invention is to provide means of simple, durable and inexpensive eonstructionfor holding a disk to be sharpw ened in proper position relative to the rolls.

More specifically it is my object to provide a disk adjusting and supporting device in which the disk may be forcibly inserted between the rolls and forcibly tilted to any de- "i sired angle relative to the'rolls and there firmly held 1n place during the operation of the rolls, and to provide such means so arranged that the various adjustments may be made during the operation of the rolls with the edge of the disk between the rolls.

4 My invention consists in the construction, arrangement and combination of the'various parts of the device, whereby the objects contemplated are attained, as hereinafter more 25 fully set forth, pointed out in my claim, and illustrated in the accompanying drawings, in which:

Figure 1 shows a front elevation of a disk sharpener embodying my invention, the posi- "a tion of the disk being indicated by dotted lines.

Figure 2 shows a side elevation of a part of a disk sharpener with my improved disk holder and adjusting mechanism applied thereto, parts thereof and of the disk being broken away.

Figure 3 shows an enlarged, vertical, sec tional view taken on the line 33 of Figure 1.

Figure 4. shows an enlarged, detail, trans verse, sectional view taken on the line H of Figure 3; and

Figure 5 shows a like view taken on the line 55 of Figure 3. '4 Referring to the accompanying drawings,

I have used the reference numeral to indicate generally the frame of a disk sharpener. Mounted in this frame are the rolls 11 having rounded forward ends which pro ject in front of the machine. These rolls are [CE I Y customarily yieldingly. held one toward the other by a sprlng not shown. 7 g My improved disk supporting and adjust- 1ng attachment comprises a main frame 12 having slidingly mounted therein a disk supporting plate upon which there isa socket 14 designed to receive and rotatively support a short shaft 15, at the upper end ofwhich are the arms 16. A disk 17 is placed in position on the arms 16 and there detachably held by 5 means of a bolt 18 extended through the disk and seated in the upper-end of the shaft 15, as shown in Figure 2.

Mounted in suitable hearings in the frame 4 12 is a shaft 19 having a squared outer end at 20vto receive a'crank for turning the shaft. Thi'sshaft is screw threaded throughout the greater portionof its length and is extended through a screw threaded opening in the frame 13, as shown in Figure 3. v v

By this arrangement it is obvious. that when the shaft 19 is rotated, the'disk supporting plate 13 will be moved longitudinally of the frame 12, and considerable power can be applied to the disk supporting plate .on account of this screwaction. Furthermore, the disk supporting plate will be held by the screw firmly fixed during any part of its movement,'thereby enabling the operator to effectthis longitudinal movement, forcibly and to hold it in any position in which it is placed, even during the operation of the rolls upon a disk carried by the disk supporting P ate-r f ,l .The inner ends of the frame 12 are pivotally connected to brackets 21 which are provided with screw threaded openings, and each of which has a'screw threaded rod 22 extended through it. These rods 22'are rota tively mounted in the main frame 10 on op.- posite sides .of the rolls. 11, and at their upper ends they are'provided with angular extensions 23 to which a iwrench or-thelike may be applied for rotating therods, and effecting a vertical adjustment of the-inner end of the mainframe12,

' In thisconnection I have found in use that attimes it is desirable to tilt one edgeof the frame 12 higher or lower than the other end, ,4

shaped disk between the rolls or'temporarily holding it in such position until the irregularly shaped portion of the disk has been rolled out to a substantially true circle.

For supporting the outer end of the main frame 12, I have provided an extensible frame comprising an upper member 24 and a lower member 25 slidingly connected with each other, as shown in Figure 5. The upper end of the frame member 24 is pivotally connected to the outer end'eof the frame mem ber 12 by the hinge members 26. In this connection I preferably make this hinge joint loosely fitted so that the outer end of the frame 12 may be tilted slightly. 2 a In the lower extensible frame member 25 there is a lug 27, and in theframe member 24 there is a corresponding 1119528,.v A screw threaded rod 29 extends through the-lug 27 and has a bearing in the lug 28, and the opening in ,thislug 27 is screw threaded to reeeive the rod 29. Theupper end of the rod is provided with a squared end at 30 to receive a wrench or: crank, or thelike,-for turning the rod. The lowerven'd of the frame member 25 is pivotally. connected at 31 withthe main frame 10, 'andthis pivotalconnection is so arranged as to permit slight tilting movements. I Yf f p I In practical use, the disk'to be sharpened is first placed upon the'arins 16 and thereheld by the bolt'18. .Thenthe disk supporting plate is tiltedlto such an angle that theedge of the disklwill be approximately parallel with the meeting edges of the rolls. Then the shaft 19 is rotated to force the disk to position within the ,rolls, preferably to a distance about'three fo-urths of aninch from the cutting edge of the rolls. 'Then the rolls' are operated in. the ordinary manner and during 's permitted to turn when in this position for this operation, thedisk is rotated. The .disk

distorted portions of the disk, it is practically impossible for the operator to hold the disk by hand in position during the entire rotation of the disk, and yet it is essential that it be so held in order that the complete disk may be rolled out true.

This operation'of making the adjustment by means of screws continues until the edge ofthe disk is rolled out to the final edge, and this results in a rerolling or reshaping of the disk in a uniform manner throughout its circumference and in sharpening the edge of the disk.

I claim as my invention i The combination with a disk sharpener having sharpening rolls, of a frame, a disk.supporting plate slidably mounted in the frame, a disk support rotatively mounted in the disk supporting plate, means for forcibly moving the disksupporting plate longitudinally of the frameandfixing it in any position of its adjustment, twobrackets pivotally connected to the inner corners of said, frame, two adjusting screws mounted in upright positions upon the disk sharpener and on opposite sides of the sharpening" rolls, and having threaded connections with said brackets and provided with means whereby they'maybe independently rotated, to thereby ,raiseflor lower the inner end of said frame, or ,to tilt said inner end of the frame laterally, and an auxiliary framehaving its lower end pivoted to a stationary support and itsupper end connected .to ,the outer end of the mainframe by means of a hinged joint loosely fitted so that the outer end of the main frame may be tilted slightly in alateral direction upon the adjustment of said screws in said, clips.

Des Moines, Iowa, April 2, 1929. v

, DENNIS C. GALVINL v sufiicient revolutions to permit theirolls to a,

roll. out anyirregularities in that portionof the disk which isengaged by the rolls, and

during this time the operator need'notbe in attendance, because the disk is firmly held .against'movement in all directions except r0,-

'tation about its own axis;

,Then, the operatoragain adjusts the device ,either' by tilting the inner end of the frame12-upwardly or downwardly with'the screw 22, or by tilting the outerend of the frame 12 upwardly or downwardly by the screw'29, or tilting the innerend of the frame 12 laterally by the adjustment of one or the other ofthe' screws 22. Any and all of these adj ustments may obviously be made while the rolls are in motion, and while the operatorcan V readily 'see what action the rolls. are produc- A v ing upon the disk, a'nd'not only upon a certain 7 portion of the disk, but on the entire circum- 1 a iference' of the disk, andthis is very important because disks to be sharpened are usually dis- Itorted whentherolls are operating upon t: 

